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iptables U32 does not work

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https://www.centos.org – When I try something like, I get:iptables -A FORWARD -p udp -m length --length 39 -m u32 --u32 '27&0x8f=7' --u32 '31=0x527c4833' -j DROPiptables: No chain/targ... [by tkalfaoglu] (Distributions)